When old, large companies become monopolists, this – always deliberate. Entry into a market can become difficult due to a lack of funding for – companies. Also, – make it hard for a small, new firm to operate as efficiently as a large, established one.

The answer is "IS NOT, NEW, and ECONOMIES OF SCALE".

Explanation:

It is not always intentional if old, and large companies are monopolistic. Market entry could be challenging because new businesses do not find, and an economic scale makes it difficult for such a small new firm to operate as effectively as a large, existing company because of the cause, big old firms benefit throughout the year for the economy of scale reducing costs and boosting earnings. Even though new businesses wish to join that market, they will not do so, because as financing necessary to compete with major customers is insufficient. As just a monopolist, it is not always a matter of course.

3rd the reason why is because of management and leadership